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Table 1 Pain evaluation between groups (VAS)

From: Effect of platelet rich fibrin on edema and pain following third molar surgery: a split mouth control study

  Group Mann Whitney U Test
n Mean Min Max SD Mean Rank U P
6 hour PRF+ 30 42.7 3.0 98.0 27.5 31.4 424.5 0.706
PRF- 30 40.0 0.0 96.0 26.3 29.7
Total 60 41.3 0.0 98.0 26.7  
12 hour PRF+ 30 36.1 0.0 99.0 28.5 32.5 390 0.374
PRF- 30 30.0 0.0 100.0 28.9 28.5
Total 60 33.0 0.0 100.0 28.6  
1st day PRF+ 30 25.0 0.0 99.0 26.3 32.4 393.5 0.398
PRF- 30 20.9 0.0 83.0 26.1 28.6
Total 60 23.0 0.0 99.0 26.0  
2nd day PRF+ 30 15.8 0.0 100.0 20.9 31.5 420.5 0.655
PRF- 30 13.8 0.0 69.0 18.4 29.5
Total 60 14.8 0.0 100.0 19.6  
3rd day PRF+ 30 7.9 0.0 51.0 12.1 30.2 439.5 0.864
PRF- 30 8.0 0.0 42.0 12.3 30.9
Total 60 8.0 0.0 51.0 12.1  
7th day PRF+ 30 1.0 0.0 12.0 3.0 31.0 434.5 0.681
PRF- 30 0.8 0.0 11.0 2.7 30.0
Total 60 0.9 0.0 12.0 2.8